body{
    margin: 0
}
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.bg{
    background: url(../images/bg2.jpg) no-repeat center center;
    background-size: cover;
}
.content{
    width: 1920px;
    height: 100vh;
    color: white;
}

/* 布局容器 */
.big_box{
    display: flex;
    /*padding: 10px;*/
    height: 100%;
}